One more initiative by Google to reach out to the community and promote free and open-source software is the The Google Highly Open Participation Contest 2007/2008.
The purpose of the competition is to enable young students older than 13 years old but have not entered yet the tertiary education, to participate in open-source development.
There are ten projects to choose to work from, one of which is GNOME, the desktop environment found in Linux distributions such as Ubuntu Linux and Fedora.
The current list of items to work on for GNOME include several documentation and translation tasks. If there is interest to work on the Greek localisation, leave a comment at this post. The direction I propose is to help with translating the documentation of GNOME applications.
Open-source software progresses by having more people contributing. This effort by Google and also previous efforts (Google Summer of Code) help tremendously towards the wider participation.